Angelina Jolie Pitt Reveals How She’s Getting Her ‘Baby Fix’ as Her Children Grow Up

Jolie Pitt, 41, is currently in Cambodia where she’s filming her next movie First They Killed My Father, which has scenes that require hundreds of children.

“I’m surrounded by toys,” Jolie Pitt told PEOPLE from her production office in Southeast Asian country. “We have 250 children in a scene, so I filled the house, my car, my trailer with toys. It’s my ‘I love babies’ fix.”

First They Killed My Father is about the Khmer Rouge genocide. She says she’s worried “this is going to be the hardest movie” on her maternal side.

“They have to go through a labor camp,” Jolie Pitt says. “They have to cry and scream. My instinct is to want to cut and hug everyone.”

The actress-director has six children with her husband Brad Pitt — Maddox, 14, Pax, 12, Zahara, 10, Shiloh, 9, and twinsKnox and Vivienne, 7 — and they’re all growing up rather quickly. Pax, the second oldest, has even started working on her sets, she says.

Pitt, 51, and Jolie Pitt recently starred in By the Sea, which was their first on-screen collaboration since 2005’s Mr. & Mrs. Smith. Written and directed by Jolie Pitt, the 1970s France set movie tells the story of a marriage in crisis.

For much more from PEOPLE‘s interview with Angelina Jolie Pitt, pick up the new issue, on newsstands Friday.